Thermostat Heater Control Circuit Low
Table of contents
P0598 MERCEDES-BENZ Possible Causes
- Faulty Thermostat Heater Control Relay
- Thermostat Heater Control Relay harness is open or shorted
- Thermostat Heater Control Relay circuit poor electrical connection
How do I fix code P0598 MERCEDES-BENZ?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- Mercedes Benz Code = 0154 (Three-disk thermostat valve) has a short circuit to ground. (P0598)
Cost of diagnosing the P0598 MERCEDES-BENZ code
The cost of diagnosing the P0598 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0598 MERCEDES-BENZ Description
This fault code is stored in the engine control module when the thermostat heater control circuit malfunctions. An electronically controlled heater element is integrated into the engine coolant thermostat. The purpose of the heater element is to allow the conventional wax thermostat to open at a lower coolant temperature. Greater cooling is required under full load conditions so the thermostat can be opened at a lower temperature to allow greater cooling. The thermostat operates in the conventional way during low or part load conditions. The thermostat heater element has a system voltage supply and a pulse width modulated ground control circuit.